KT-4107 Data objects

compiler/testData/diagnostics/tests/dataObjects/overrideEqualsAndHashCode.kt

@@ -0,0 +1,44 @@
+// FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
+data object Override {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return true
+    }
+
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun hashCode(): Int {
+        return 1
+    }
+}
+
+open class Base {
+    open fun hashCode(x: Int) = x
+}
+
+data object NoOverride: Base() {
+    fun equals(other: Any?, tag: Int): Boolean {
+        return true
+    }
+
+    fun hashCode(param: String): Int {
+        return 1
+    }
+
+    override fun hashCode(x: Int) = x + 1
+}
+
+open class Super {
+    override fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+
+    override fun hashCode(): Int {
+        return 1
+    }
+}
+
+data object OverridenInSuper: Super() {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+}

compiler/testData/diagnostics/tests/dataObjects/overrideEqualsAndHashCode.txt

@@ -0,0 +1,40 @@
+package
+
+public open class Base {
+    public constructor Base()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open fun hashCode(/*0*/ x: kotlin.Int): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public data object NoOverride : Base {
+    private constructor NoOverride()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun equals(/*0*/ other: kotlin.Any?, /*1*/ tag: kotlin.Int): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun hashCode(/*0*/ x: kotlin.Int): kotlin.Int
+    public final fun hashCode(/*0*/ param: kotlin.String): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object Override {
+    private constructor Override()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object OverridenInSuper : Super {
+    private constructor OverridenInSuper()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public open class Super {
+    public constructor Super()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}